A point charge is an idealized model of a particle which has an electric charge. A point charge is an electric charge at a mathematical point with no dimensions.
The fundamental equation of electrostatics is Coulomb's law, which describes the electric force between two point charges. The electric field associated with a classical point charge increases to infinity as the distance from the point charge decreases towards zero making energy (thus mass) of point charge infinite.
Earnshaw's theorem states that a collection of point charges cannot be maintained in an equilibrium configuration solely by the electrostatic interaction of the charges.
Read more about this topic: Point Particle
Famous quotes containing the words point and/or charge:
“The whole point about the true unconscious is that it is all the time moving forward, beyond the range of its own fixed laws or habits. It is no good trying to superimpose an ideal nature upon the unconscious.”
—D.H. (David Herbert)
“Martial, the things for to attain
The happy life be these, I find:
The riches left, not got with pain;
The fruitful ground, the quiet mind;
The equal friend; no grudge nor strife;
No charge of rule nor governance;”
—Martial (Marcus Valerius Martialis)